Linux-audio-tuning

linux-audio-tuning@lists.linuxaudio.org

53 discussions

[LAT] linuxaudio.org maintenance window 2019-09-10

by Jeremy Jongepier

Dear all, Tuesday September 10 I'd like to perform some maintenance on the linuxaudio.org servers between 09:00 and 12:00 CEST. Maintenance consists mainly of performing updates on the servers and booting them with the latest kernels. Downtime and impact should be minimal but if any weird things happen then please let me know at jeremy(a)linuxaudio.org. Best regards, Jeremy

6 years, 4 months

[LAT] linuxaudio.org is back online!

by Jeremy Jongepier

Dear all, We just enabled all mail services for linuxaudio.org again. All mailing lists are working again and mail can be sent and received for the linuxaudio.org domain. A short recap of what happened is that linuxaudio.org got compromised on January 29th, probably with a compromised private SSH key or password from an account with shell access. The attacker checked the kernel, saw that it was vulnerable to Dirty COW¹, pulled in an exploit and got root. This was quickly discovered by the IT department of Virginia Tech University that disconnected the server from the internet and started a forensic investigation procedure. As part of their IT security policy the server had to be reinstalled and everything had to be set up from scratch again. In the meanwhile I built an alternative setup and after some discussion we agreed on moving linuxaudio.org away from the Virginia Tech server. So linuxaudio.org got a new home after 15 years at Virginia Tech². We're very, very thankful that we could host linuxaudio.org on their servers and we can't stress enough how grateful we are for all the work that has been done on the side of Virginia Tech after the hack. linuxaudio.org now lives at Fuga³, a fully open source OpenStack⁴ cloud based in The Netherlands. Fuga is part of Cyso⁵, the company I work for. The linuxaudio.org ecosystem now consists of three separate servers, a web server, a mail server and a storage server. We rebuilt everything with portability and scalability in mind with a strong focus on security. You can never prevent passwords or SSH keys getting into the hands of hackers but we'll try to keep the servers as up to date as we can to narrow down the attack surface as much as possible. A big thank you to all those who helped out! It was quite a ride but it seems as if most part of the linuxaudio.org ecosystem is accessible again. If you find any web pages, downloads or other bits and parts that don't work properly then please let us know so we can take a look at it. Many thanks in advance and also many thanks for bearing with us! Best, Jeremy Jongepier root(a)linuxaudio.org ¹ https://dirtycow.ninja/ ² https://icat.vt.edu/ ³ https://fuga.cloud/ ⁴ https://www.openstack.org/ ⁴ https://cyso.com/en/

7 years, 10 months

[LAT] Question about this list

by Crojav

Hi All Having a question, what takes place on this list. What is the meaning of "tuning"? Microtuning or tuning as "car tuning"? Regards Crojav

8 years, 8 months

[LAT] 3.x kernel

by Emanuel Rumpf

I've had no success with any of the 3.x real-time kernels so far. The GUI does not respond. Graphical terminals freeze. Often jack(dbus) doesn't start or freezes too. It seems, the GUI doesn't get enough CPU cycles. Although the system load appears very low ! Is this a known issue ? My mis-configuration ? Can someone point to a working kernel or config for debian/ubuntu 64bit ? -- E.R.

13 years, 8 months

[LAT] scheduled server downtime - 10/Jan/12 - linuxaudio.org

by Robin Gareus

Hi all, As you may or may not have noticed, linuxaudio.org was rebooted today 15:06 UTC. The server now features shiny (faster) new virtual HDDs (with backups and everything..). Sponsored by the Virginia Tech Department of Music and DISIS. Cheer a loud "Hip Hip,..." to Ico, who made it possible in the first place and send Kudos to Brian Maloney from the vt.edu tech dept for outstanding excellent GNU/Linux support! All systems go. robin

13 years, 12 months

[LAT] scheduled server downtime - 10/Jan/12 - linuxaudio.org

by Robin Gareus

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi *, linuxaudio.org will be offline for scheduled server maintenance on Tue, 10 Jan 2012 14:00 UTC for about 2-3 hours. All online services will be unavailable during that time. If all goes well (new disks, fsck, kernel-update,..) the actual downtime will be much shorter.. thanks for bearing with us, robin -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEARECAAYFAk8IZxUACgkQeVUk8U+VK0KJXgCgjbxcqXk4U9tzzBjWDbY/F7B9 RkQAoLHYKxinF9fWLkOyzJMyuRqqSKIP =U5Uj -----END PGP SIGNATURE-----

14 years

[LAT] To much latency

by Dave Stikkolorum

Hi, I am a musician and programmer. I use a laptop with an internal soundcard (intel) and ubuntu studo. When I see the qjack control settings window I always see a 46.6 ms latency. On a older Desktop computer with an internal ac97 soundcard or an pci sweex (cheap) I have the same problem. Reducing the sample period to 512 , reduces the latency, but always ends up with problems. My question is how to have a good studio setup for recording (and playing midi in the background)? Is it possible to better the performance with an external soundcard? What are your experiences? I also tried ccma an av linux, but the same problems. Anyone suggestions? Regards, Dave Stikkolorum

14 years

Re: [LAT] To much latency

by Jeremy Jongepier

On 11/03/2011 11:55 AM, Dave Stikkolorum wrote: > 47: 774 536 PCI-MSI-edge hda_intel Thanks! So with the help of MSI your soundcard is sitting on its own IRQ so that is not causing any issues. Hopefully optimizing yours system yields better performance. I'd start with setting CPU scaling to performance. Best, Jeremy

14 years, 2 months

[LAT] rt kernel 2.6.39

by Emanuel Rumpf

Hi Somehow I've not succeeded yet, making a functional rt kernel, with 2.6.39 If anyone has a working config, let me know. ( 64 bit, intel i7, nvidia - nouveau ) Thanks. -- E.R.

14 years, 7 months

[LAT] Document on using Jack Apps

by Arvind Venkatasubramanian

Hello: I am very much new to Linux and Linux audio. I am trying to measure audio IO latency for my system. Jdelay seems to be the right tool but when I run it on the terminal, I am getting message "Signal below threshold..." which probably might be because Jack is trying to capture audio and ends up getting the low noise floor because I do not have meaningful signal source connected. But then I tried to patch the this App to the qJACKctl app but the settings console is not straight forward to interpret. as it involved many parameters. I guess there are # of frames per period that may eventually be used to calculate the target latency but *is there a step-by step document description for Jdelay and any other JACK tools and also using JACK audio server in an effective manner*? Also, qJACKctl console does not offer options for very low sampling rates like 8 KHz. With ALSA, this should be possible but may be this particular tool does not support it. Can anyone help here? Thanks, -F

15 years, 5 months

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Linux-audio-tuning